ESP32-WROOM-32 & BH1750-获取环境亮度并调节屏幕亮度

一、电路连接

二、烧录测试程序

#include <Wire.h>
#include <BH1750.h>
 
BH1750 lightMeter;
 
void setup(){
 
  Serial.begin(9600);
 
  // Initialize the I2C bus (BH1750 library doesn't do this automatically)
  // On esp8266 devices you can select SCL and SDA pins using Wire.begin(D4, D3);
  Wire.begin();
 
  lightMeter.begin();
  Serial.println(F("BH1750 Test"));
 
}
 
void loop() {
 
  float lux = lightMeter.readLightLevel();
  Serial.print("Light: ");
  Serial.print(lux);
  Serial.println(" lx");
  delay(1000);
 
}

对于 ESP32，根据您使用的是什么板，SDA 和 SCL 默认引脚可能不同。如果那是 ESP32 WROOM 开发套件，那么默认情况下，您的 SDA 引脚为 21，SCL 引脚为 22。或者您可以简单地使用：
Wire.setPins(, );
并将您使用的任何引脚号替换为 SDA 和 SCL。您只需在 Wire.begin() 命令之前执行此操作。

三、通过蓝牙串口将环境亮度数据传给pc

#include <Wire.h>
#include <BH1750.h>
#include <Arduino.h>
#include "BluetoothSerial.h"
 
#if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED)
#error Bluetooth is not enabled! Please run `make menuconfig` to and enable it
#endif
 
BH1750 lightMeter;
BluetoothSerial SerialBT;
 
void setup(){
  pinMode(LED_BUILTIN, OUTPUT);
  SerialBT.begin("ESP32test"); //Bluetooth device name
  
  Serial.begin(115200);
 
  // Initialize the I2C bus (BH1750 library doesn't do this automatically)
  // On esp8266 devices you can select SCL and SDA pins using Wire.begin(D4, D3);
  Wire.begin();
 
  lightMeter.begin();
  Serial.println(F("BH1750 Test"));
 
}
 
void loop() {
  digitalWrite(LED_BUILTIN, HIGH);
  float lux = lightMeter.readLightLevel();
  while (SerialBT.available() > 0){
    delay(10);
  }
  SerialBT.println(lux);
  Serial.print("Light: ");
  Serial.print(lux);
  Serial.println(" lx");
  digitalWrite(LED_BUILTIN, LOW);
  delay(100);
 
}

四、pc端python接收

# coding=gbk
import serial
import time
 
while True:
    ser = serial.Serial('com12', 115200, parity='E', stopbits=1, bytesize=8, timeout=0.5)
    print('光照强度：' + ser.readline().decode('gbk'))
    time.sleep(1)
    ser.close()

五、python修改屏幕亮度（vga不支持）

# coding=gbk
import serial
import time
import screen_brightness_control as sbc
 
while True:
    ser = serial.Serial('com12', 115200, parity='E', stopbits=1, bytesize=8, timeout=0.5)
    print('光照强度：' + ser.readline().decode('gbk'))
    sbc.set_brightness(float(ser.readline().decode('gbk'))/5) #亮度调节，这颗传感器的分辨率范围为（0-54612.5）
    time.sleep(1)
    ser.close()

库链接

https://github.com/claws/BH1750